Official Course Description: MCCCD Approval: 07/22/08
WRT105 19986-20086	LEC	4 Credit(s)	4 Period(s)
ELECTRICITY, MOTORS, AND CONTROLS FOR WATER STUDIES
Overview of electricity related to water studies. Operation of and use of electrical meters. Calculate electrical loads and evaluate power sources. Types of single phase motors and determining resistance of motors and motor terminals. Function of electro-magnetic solenoids and transformers. Calculations of transformer voltage/current relationship. Principles of three-phase motors. Wye and Delta wiring. Calculation of motor current draw. Sequence of operation, wiring diagram, and electrical components of equipment. Control theory , pneumatics, electrical, electronic controls devices, flow control devices, elementary and advanced control systems. Prerequisites: None. Corequisites WRT105LL or permission of Department or Division.

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MCCCD Official Course Competencies:
WRT105   19986-20086	ELECTRICITY, MOTORS, AND CONTROLS FOR WATER STUDIES

1.	Explain the relationships and electrical charges of basic parts of atoms. (I)
2.	Compare and contrast good conducting materials and good insulating materials. (II)
3.	Define terms related to specific electrical quantities, state Ohm's Law and solve specific problems using Ohm's law equations. (III)
4.	Explain the operation of and safety standards for use of electrical meters for determination of voltage, resistance, and current. (IV)
5.	Calculate electrical loads for series, parallel and series- parallel circuits, using rules for each type of circuit and Ohm's law equations. (V)
6.	Define specific terms associated with electrical power sources and alternating power production and evaluate specific electrical sources at location, determining voltage, phase and type of transformer service. (VI)
7.	Given resource materials, calculate wire size based upon wire resistance, length of run, load, temperature and other de- rating factors. (VII)
8.	Explain types of loads and power factors of those loads related to specific electrical equipment. (VIII)
9.	List specific types of single phase motors and explain how the electrical fields produce rotating effects and determine winding resistance of hermetic compressor motors and motor terminals. (IX)
10.	Explain the operation of motor overloads including solder melting and specific thermal overloads. (X)
11.	Describe the electro-magnetic solenoid, explain its function and relationship to relays, contactors, and magnetic line starters. (XI)
12.	Define and describe specific control terminology and theory. (XII)
13.	Describe the type and operation of pneumatic controls. (XIII)
14.	Determine specific control operating parameters and errors. (XIV)
15.	Compare and contrast specific electric and electronic control devices. (XV)
16.	Explain the operation and application of dampers and valves. (XVI)
17.	Design and evaluate specific electrical and programmable logic controller (PLC) control systems. (XVII)
18.	Explain principles of operation for three phase motors. (XVIII)
19.	Identify, translate and draw the types of wiring diagrams and explain high/low voltage for each. (XIX)
20.	Explain the purpose of torque and how it is produced in motors. (XX)
21.	Using the data on motor nomenclature plates and the National Electrical Code (NEC), calculate motor current draw. (XXI)
22.	Given electrical components for a specific application, develop sequence of operation. (XXII)
23.	Using the theory of electrical circuits, write a procedure for evaluating electrical problems, including appropriate safety procedures. (XXIII)

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MCCCD Official Course Outline:
WRT105   19986-20086	ELECTRICITY, MOTORS, AND CONTROLS FOR WATER STUDIES

I. Basic Atomic Structure A. Neutron 1. parts 2. electrical charge 3. relationship B. Proton 1. parts 2. electrical charge 3. relationship C. Electron 1. parts 2. electrical charge 3. relationship II. Material Differentiation A. Conductors 1. number of electrons in valance shell 2. distance of valance shell from nucleus B. Insulators 1. number of electrons in valance shell 2. distance of valance shell from nucleus III. Electrical Terms, Ohm's Law, and Equations A. Terms 1. coulomb 2. ampere 3. voltage 4. ohm 5. watt B. Ohm's Law 1. statement 2. equation C. Equations 1. E=1R 2. 1=E/R 3. R=E/1 IV. Electrical Meter Operations/Safety/Purpose A. Volt meter B. Ammeter C. Ohmmeter D. Readings 1. analog 2. digital V. Electrical Circuits Loads A. Series 1. total resistance 2. current 3. voltage 4. rules 5. equations B. Parallel 1. total resistance 2. current 3. voltage 4. rules 5. equations C. Series-parallel 1. rules 2. equations VI. Electrical Services A. Definition of terms 1. hertz 2. single phase 3. three phase 4. delta 5. wye 6. phase voltage 7. line voltage 8. phase current 9. line current B. Evaluation of sources/voltage/phase/type 1. transformers (Power) 2. loads 3. alternating power generation 4. open delta 5. panel box(es) VII. Wire Sizing/Code/Insulation A. Wire resistance 1. diameter 2. type of materials 3. length 4. load 5. temperature 6. other factors B. National Electrical Code (NEC) 1. specific reference 2. other notes C. Insulation 1. type 2. voltage rating VIII. Electrical Loads/Power Factors A. Resistive B. Inductive C. Capacitive D. Inductive - reactance E. Capacitive - reactance IX. Single Phase Motors A. Types 1. split phase 2. shaded pole B. Electrical fields - Components 1. windings 2. starting 3. reversing the direction 4. dual voltage 5. starting capacitors 6. running capacitors C. Characteristics - Torque D. Terminal identification 1. motor windings 2. terminals X. Motor Overloads A. Solder melting B. Thermal (bimetal) 1. two-wire 2. three-wire 3. four-wire 4. other XI. Electro-Magnetic Solenoid A. Definition B. Function 1. shading coil 2. laminated core C. Relationship 1. relay 2. contactor 3. magnetic line starter (motor starters) XII. Terminology and Theory of Controls A. Terminology B. Theory C. Energy sources XIII. Pneumatic Controls A. Operation B. Types 1. electric 2. electronic 3. pneumatic 4. hydraulic 5. self-contained XIV. Control Parameters A. Operating parameters B. Operating errors XV. Electric and Electronic Controls A. Electric control devices B. Electronic control devices XVI. Dampers and Valves A. Operating principles B. Applications C. Pressure drop calculations XVII. Electrical and Programmable Logic Control (PLC) A. Diagramming B. Equipment A. Operation B. Logic Diagram C. Equipment Interface D. Evaluation of systems XVIII. Three Phase Motors A. Operation B. Types (rotors) 1. squirrel cage 2. wound rotor 3. synchronous C. Field factors 1. voltage phase angle 2. change in polarity 3. arrangement of stator windings XIX. Motor Wiring Diagrams A. Wye 1. high voltage 2. low voltage B. Delta 1. high voltage 2. low voltage C. Twelve lead motors D. Direction change XX. Torque A. Major factors 1. strength of magnetic field - starter 2. strength of magnetic field - rotor 3. phase angle of currents B. Load effects C. Phase angle - maximum torque D. Function XXI. Current Motor Draw A. Types of rotors B. NEC tables C. Calculations XXII. Sequence of Operation A. Wiring Diagrams 1. pictorial 2. line B. Components C. Sequence of operation D. Diagramming E. Ladder/Line diagrams F. Control panels G. Component location H. Terminal identification I. Wire numbering J. Illustrating XXIII. Electrical Circuit Evaluation Procedure A. Electrical theory B. System type C. Operating sequence D. Procedure 1. electrical supply 2. operating loads 3. non-operating loads 4. sequence 5. safety

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